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Finding the Fourth Proportional to 1,379.11, 1,903.10 and 819.57

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Solution

The fourth proportional to 1,379.11, 1,903.10 and 819.57 is: 1,130.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.11 : 1,903.10 = 819.57 : x
  2. Step 2: Convert to fraction form
    1,379.11/1,903.10 = 819.57/x
  3. Step 3: Cross multiply
    1,379.11x = 1,903.10 × 819.57
  4. Step 4: Simplify right side
    1,379.11x = 1,559,722.92
  5. Step 5: Solve for x
    x = 1,559,722.92/1,379.11
  6. Step 6: Final answer
    x = 1,130.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.